Re: transpose leadsheet (chords + melody)

To transpose a song down a whole step, say from F major to Eb
major, the

syntax would be:

\transpose c bes (or however the language you are using
signifies a Bb)

Be careful here, because both pitches are taken absolute, so being bes
in the same octave as c, this transposing has the effect of raising a
minor seventh up.
Use
\transpose d c
or
\transpose c bes,
(note the comma), to transpose a whole step down.